尝试在Debian Jessie上安装Certbot时，我需要根据certbot安装说明进行反向移植。失败了 然后，我尝试将Backborts添加到Debian sources.list文件中。它也失败了。那么如何在Jessie上安装Certbot？我也想知道如何添加反向端口。
这是我的尝试：
root@deployer:~# apt-get install certbot
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package certbot
root@deployer:~# apt-get install certbot
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package certbot
root@deployer:~#
root@deployer:~# cat /etc/*-release|grep VER
VERSION_ID="8"
VERSION="8 (jessie)"
root@deployer:~# echo deb http://ftp.debian.org/debian/dists/jessie-backports/ jessie-backports main > /etc/apt/sources.list
root@deployer:~# cat /etc/apt/sources.list
deb http://ftp.debian.org/debian/dists/jessie-backports/ jessie-backports main
root@deployer:~# apt-get update
Ign http://ftp.debian.org jessie-backports InRelease
Ign http://ftp.debian.org jessie-backports Release.gpg
Ign http://ftp.debian.org jessie-backports Release
Err http://ftp.debian.org jessie-backports/main amd64 Packages
404 Not Found [IP: 130.89.148.12 80]
Ign http://ftp.debian.org jessie-backports/main Translation-en_US
Ign http://ftp.debian.org jessie-backports/main Translation-en
W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-backports/dists/jessie-backports/main/binary-amd64/Packages 404 Not Found [IP: 130.89.148.12 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.
root@deployer:~# apt-get install certbot
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package certbot
root@deployer:~#
要将反向移植添加到您的sources.list，必须/etc/apt/sources.list添加以下行来编辑文件：
deb http://ftp.debian.org/debian jessie-backports main
编辑source.list文件后，必须在安装软件包之前运行apt-get update.So，请运行：
apt-get update
现在，您可以安装软件包了：
apt-get -t jessie-backports install "package"
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